Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2024	Aug. 31, 2023
Pension Plans [Member] | U.S. Plans [Member]
Net Periodic Benefit Cost
Service cost	$ 125	$ 136
Interest cost	361	341
Expected return on plan assets	(430)	(400)
Amortization of prior service credit and other	(2)	(2)
Net periodic benefit cost	54	75
Pension Plans [Member] | International Pension Plans [Member]
Net Periodic Benefit Cost
Service cost	9	10
Interest cost	12	10
Expected return on plan assets	(5)	(4)
Amortization of prior service credit and other	0	0
Net periodic benefit cost	16	16
Postretirement Healthcare Plans [Member]
Net Periodic Benefit Cost
Service cost	7	7
Interest cost	16	16
Expected return on plan assets	0	0
Amortization of prior service credit and other	(1)	0
Net periodic benefit cost	$ 22	$ 23